Limitation of voltage fluctuations and flicker in low-voltage supply systems for equipment with rated current <=16 A
This section is concerned with the limitation of voltage fluctuations and flicker impressed on the public low-voltage system.
It specifies limits of voltage changes which may be produced by an equipment tested under specified conditions and gives guidance on methods of assessment
This section is applicable to electrical and electronic equipment having an input current up to and including 16 A per phase and intended to be connected to public low-voltage distribution systems of between 220 V and 250 V at 50 Hz line to neutral
The test according to this section are type tests. Particular test conditions are given in annex A and the test circuit is show in figure1 of the standard.
voltage fluctuation: A series of voltage changes or a continuous
variation of the r.m.s. voltage.
The limits shall be applicable to voltage fluctuations and flicker at the supply terminals of the equipment under test, measured or calculated according to clause 4 under test conditions described in clause 6 and annex A (in the standard). Tests made to prove the compliance with the limits are considered to be type tests.
The following limits apply:
If voltage changes are caused by manual switching or occur less frequently than once per hour, the Pst and Plt requirements shall not be applicable. The three requirements related to voltage changes shall be applicable with the previously mentioned voltage values, multiplied by a factor of 1.33.
The limits do not apply to emergency switching or emergency interruptions.
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